<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>test ......</title>
    <style type="text/css">
        *{
            margin: 0;
            padding: 0;
        }
        .wrap{
            display: flex;
            align-items: flex-start;
        }
        .item{
            background: orange;
            border:1px solid #ccc;
            flex: 1;
        }
        .item-3{
            height: 300px;
        }
    </style>
</head>
<body>
    <div class="wrap">
        <div class="item item-1">1111111111</div>
        <div class="item">22222222</div>
        <div class="item item-3">333333333333</div>
    </div>
</body>
</html>